Go take a look at charts.py within the main Vincent package and you’ll see that we’re using Vincent to build Vincent! This module is the home for convenience chart builds, such that we can do things like bar=vincent.Bar([10,20,30]). This package still needs maps, pie charts, donut charts, treemaps, faceted charts, etc. If you use Vincent to build a new chart, make a pull request for this module. Make sure you add a test with valid grammar to test_charts.py

Vincent uses the Nose library for testing, and aims for reasonable test coverage. Take a look at test_charts.py and test_vega.py to get an idea of what our tests look like, and please add coverage for anything you add.